DALLAS (CBSDFW.COM) – On the same day Dallas police identified the officers involved in Monday’s standoff and shooting, a Dallas barber who claims he shot video of the chase says the ordeal has left him sleepless.

Rodney Chambers says he saw it from beginning to end. He heard helicopters first, then watched from his barbershop and took pictures as suspect Michael Mayo’s car stopped a few yards away.

“It was kind of shocking to me because I was in there cutting hair,” says Chambers, who remembers Mayo not being able to crank his car over, get out of it and holler and wave at police, then get back in. “And sometimes he put his gun to his mouth and we thought we were going to see him do that. And then he put it to his head, like he was frustrated.”

This went on for some time and Chambers, disbelieving, caught some of it on his cell phone. He saw Mayo smoking cigarettes and talking on his cellphone. Unlike other witnesses who claimed Mayo pointed his gun at police, Chambers believes it was in Mayo’s other hand.

“He’s getting out of the car and he’s pointing at the police with this hand, but he didn’t have nothing in it, though, but he was pointing at them shouting something at them. And they shot him,” according to Chambers.

Fellow barber James Spears arrived when it was over to find his co-worker in shock.

“I can tell that it disturbed him because the first thing when I came in I could see the look in his yes, and Whoa! Something really happened,” said Spears, who is a military veteran. He understands the emotional impact witnessing a traumatic situation can have on a person.

Chambers said it was all very unsettling. “Man, I ain’t been able to sleep, it’s been crazy, man. It’s scary because you see somebody alive, he’s alive and then you know his life is taken. It’s just something I’ll never, ever forget, really.”

Chambers’ video is the kind of evidence Dallas police want to review in the shooting. And even though they aren’t giving interviews, they have identified the officers involved as 18-year-veteran Sr. Cpl Gerardo Huante, Sr. Cpl Robert Hamilton, on the force 16-years, and Sr. Cpl. Marshall Milligan a 5-year DPD veteran.